LEMON Manuals: Even more car manuals for everyone
Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Engine Controls - Tests W/Codes - Non-Turbo (M/T) - MOTRONIC 4.4) >> Circuit Tests >> DTC 447 - Pulsed Secondary Air Injection System (Pair) Solenoid Valve Signal >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check status message on scan tool. If status message is PERMANENT FAULT, SIGNAL TOO HIGH, go to next step. If status message is PERMANENT FAULT, SIGNAL TOO LOW, go to step 3). If status message is PERMANENT FAULT, SIGNAL MISSING, go to step 4). If status message is INTERMITTENT FAULT, SIGNAL TOO HIGH, check wiring between solenoid valve terminal No. 2 and ECM connector terminal A37 for an intermittent short circuit to voltage. If status message is INTERMITTENT FAULT, SIGNAL TOO LOW, check wiring between solenoid valve terminal No. 2 and ECM connector terminal A37 for an intermittent short to ground. If status message is INTERMITTENT FAULT, SIGNAL MISSING, go to step 7).
  2. Turn ignition off. Disconnect solenoid valve connector. Turn ignition on. Connect test light between solenoid valve connector terminal No. 2 and ground. If test light does not come on, replace solenoid valve. If test light comes on, check wiring between solenoid valve connector terminal No. 2 and ECM connector terminal A37 for a short circuit to voltage.
  3. If status message is PERMANENT FAULT, SIGNAL TOO LOW, turn ignition off. Disconnect solenoid valve connector. Check wiring between solenoid valve terminal No. 2 and ECM connector terminal A37 for a short circuit to ground.
  4. If status message is PERMANENT FAULT, SIGNAL MISSING, turn ignition off. Disconnect solenoid valve connector. Turn ignition on. Connect voltmeter between solenoid valve connector terminal No. 1 and ground. If voltmeter reads battery voltage, go to next step. If voltmeter does not read battery voltage, check wiring between solenoid valve terminal No. 1 and main relay for an open circuit.
  5. Turn ignition off. Connect ohmmeter between solenoid valve terminals No. 1 and 2. If ohmmeter reads 30-33 ohms, go to next step. If ohmmeter does not read 30-33 ohms, replace solenoid valve.
  6. Connect breakout box to ECM connector. Connect ohmmeter between breakout box pin No. 37 and solenoid valve connector terminal No. 2. If ohmmeter reads about zero ohms, DTC is caused by poor contact in ECM and/or solenoid valve connector. If ohmmeter does not read about zero ohms, check for open circuit in wiring between solenoid valve terminal No. 2 and ECM connector terminal A37.
  7. If status message is INTERMITTENT FAULT, SIGNAL MISSING, check solenoid valve and/or ECM connector terminals for poor terminal contact. Check wiring between solenoid valve terminal No. 1 and main relay terminal No. 3 for an intermittent open circuit. Also check wiring between solenoid valve terminal No. 2 and ECM connector terminal A37 for an intermittent open circuit.
scientia non olet · About LEMON Manuals